1=3(1)+b

Solution for 1=3(1)+b equation:

Simplifying
1 = 3(1) + b

Multiply 3 * 1
1 = 3 + b

Solving
1 = 3 + b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-1b' to each side of the equation.
1 + -1b = 3 + b + -1b

Combine like terms: b + -1b = 0
1 + -1b = 3 + 0
1 + -1b = 3

Add '-1' to each side of the equation.
1 + -1 + -1b = 3 + -1

Combine like terms: 1 + -1 = 0
0 + -1b = 3 + -1
-1b = 3 + -1

Combine like terms: 3 + -1 = 2
-1b = 2

Divide each side by '-1'.
b = -2

Simplifying
b = -2